Graining-rolls for graining explosive powder.



F. I. DU FONT.

GRAINING ROLLS r011 GRAINING EXPLOSIVE POWDER.

APPLICATION FILED FEB. 13, 1909. 993,353, Patented May 30,1911.

3 SHEETS-SHEET l.

WITNESSES: F/ M/VE/VTOR edl @FM P. I. DU PONT.

GRAINING ROLLS FOR GRAINING EXPLOSIVE POWDER.

APPLICATION FILED FEB. 13, 1909.

Patented May 30, 1911.

3 SHBETSSHBET 2.

F. I. DU PONT.

GRAINING ROLLS FOR GRAINING EXPLOSIVE POWDER APPLIOATION FILED FEB. 13, 1909.

Patented May 30. 1911.

3 SHEETS-S H BET 3.

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UN"TE STATES PATENT OFFICE.

FRANCIS I. DU PON'I', OF WILMINGTON, DELAWARE, ASSIGNOR TO THE E. I. DU PONT DE NEMOURS POWDER COMPANY, OF WILMINGTON, DELAWARE, A CORPORATION OF NEW JERSEY.

GBAINING-ROLLS FOR GRAINING EXPLOSIVE POWDER.

Specification of Letters Patent.

Patented May 30, 1911.

Application filed February 13, 1909. Serial No. 477,554.

To all whom it may concern:

Be it known that I, FRANCIS I. DU Pour, a citizen of the United States, residing at Wilmington, county of New Castle, and State of Delaware, have invented a new and useful Improvement in Graining-ltolls for Graining Explosive Powder, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, which form a partof this specification.

Heretofore the construction of graining rolls has been quite complicated, consisting of independent cutters inset into the face of the roll or drum, and of shape to cut the desired form of grain, and hence are quite diflicult of precise and proper construction..

I provide my graining rolls along the length of the face of the roll with a plurality of circumferential grooves intersected by a plurality of longitudinal radial grooves. In each of these longitudinal grooves is placed a cutter bar having on its outer face cutters. These cutter bars have free ends which rest in a circumferential groove in the face of an eccentric disk. In the revolution of the rolls, the cutter bars are given a vertical, or in and out movement, in the longitudinal grooves in the face of the graining roll. The parts are so arranged that the cutting edges of the cutter bars coincide with the top of the circumferential grooves in the roll at the place where the powder strip is fed between the rolls and coacts with the circumferential grooves to cut the powder grains to proper form, and the cutter bars are moved to the bottom of the grooves at the point where the scraper acts to clean the grains out. This enables the cutting or graining surface of the graining rolls to be readily and simply fiormed. At the same time it enables the cutters to be moved to the surface for graining and below the surface for removing the grain.

I will now describe the embodiment of my invention illustrated in the accompanying drawings and then point out the invention in the claims.

In the drawings: Figure 1 is a plan View of my apparatus for graining explosive powder. Fig. 2 is an elevation of same partly in section. Fig. 3 is a section through same on line 3----3, Fig. 1. Fig. 4 is an enlarged longitudinal section through one of the graining rolls. Fig. 5 is an end view partly in section. Fig. 6 is a face view of one of the eccentric disks taken as on line (3-43, Fig. 4. Fig. 7 is a plan view of one of the scrapers. Fig. 8 is an elevation of a cutter bar and Fig. 9 is a section through same on line 9-tl. Fig. 10 is a face view of the gear f, shaft (Z, arm g, lugs t, t, and screws 71., and their relative position with respect to each other.

a is one graining roll, b the other graining roll mounted to revolve respectively with the shafts c and J. c is a gear on shaft 0, and f is a gear on shaft 0, the two gears intermeshing. The shaft (Z is driven by any appropriate means, not shown, and the motion is transmitted through the gears and c to shaft 0. The gear f is loose on the shaft (Z. 9 is an arm keyed to shaft d. t t are lugs on the gear f, through orifices in which lugs, the set screws it pass. The arm 9 projects in line with the set screws IL, theconnection between the gear f and shaft d being through the arm g. By this arrangement the gear f has a movement upon the shaft d the extent of which is controlled by the position of the set screws h.

The longitudinal surface of each graining roll a and Z) is provided with a series of circumferential grooves z' and a series of longitudinal radial grooves k are the cutter bars. On each end of these bars is the cut away extension Z of greater width than the cutter bar proper (see Fig. 9). The cutter bar proper is provided with the cutters m. The cut away extension Z, at each end of cutter bars, rests in a circumferential groove 0 in the face of an eccentric disk n. The disks are mounted up on the bushing p which eccentrically surrounds but does not revolve with the shaft 0. The cutter bars proper rest in the grooves j. As was stated, the extensions Z are thicker or greater in cross section than the cutter bar proper, so that when all the cutter bars are inserted in the longitudinal grooves with their extensions in the groove in eccentric disks, the extensions contact with each other and thus fill up the groove.

2 are .the scraper bars, one secured to the housings of each graining roll. Each bar has on its edge the scrapers, 20, equal in graining number to the circumferential grooves in its corresponding graining roll and supported in such a position that, in the rotatien of the roll, the scrapers enter the circumferential grooves and clear the grains therefrom.

, grooves in the rolls at the point of cutting or the powder strip, and draw them in, to allow the scrapers to act, 1n the circumferential groovcs.

The connection of the gear f to its shaft.

enables the graining rolls to be properly adjusted with respect to each other.

Having now fully dmcribed my invention, what I claim and desire to protect by Letters Patent is: v

1. In an apparatus for explosive -powder, in combination, grainlng rolls havmg circumferential and longitudinal grooves in their faces, cutter bars, having cutting edges, in said radial longitudinal grooves,

' means adapted in the rotation of the rolls to move said cutter bars vertically and means to give one of said rolls a definite and limited rotary movement independent of the other.

2. In an apparatus for graining explosive powder, in combination, graining rolls, each having circumferential and longitudinal grooves in their faces, cutter bars, having cutting edges, in said radial longitudinal grooves, means adapted, in the rotation of the rolls, to move said cutter bars vertically, and a scraper bar having scrapers in line with the circumferential grooves in the rolls at a point below the surface of the rolls.

3. In an apparatus for graining explosive powder, in combination, graining rolls, shafts for said rolls, each of said rolls having circumferential and longitudinal grooves, cutter bars, having cutting edges, in said radial longitudinal grooves, disks eccentrically mounted, each of said disks having a circumferential groove, extensions from said cutter bars in said disk groove and supporting said cutter bars, and scraper bars having scrapers in line with the circumferential grooves in the roll at a point below the surface of the roll.

4:. In an apparatus for graining explosive powder, in combination, grainin rolls, shafts for said rolls, each of said ro having circumferential and longitudinal grooves,

cutter bars resting in said disk groove and supporting said cutter bars, the extensions of said cutter bars restin in said groove being thicker than the mam portion of the cutter bars.

5. In an apparatus for graining explosive powder, in combination, graining rolls, shafts for said rolls, each of said rolls having circumferentialand longitudinal grooves, cutter bars, having cutting edges, in said radial longitudinal grooves, disks eccentrically mounted, each of said disks having a circumferential groove, extensions from" said cutter bars, resting in said disk groove and supporting said cutter bars, the extensions of said cutter bars resting in said grooves being thicker than the main portion of the cutter bars, and a scraper .bar having,

scrapers in line with the circumferential ooves in the roll at a point below thesurace of the roll.

6. In an apparatus for graining explosive powders, in combination, a pair of graining rolls, cutter bars in the face of said rolls, a shaft for each roll, inter'meshing gears carried by the respective shafts, one of said gears being fixed to its shaft, the other gear being loose on its shaft, an adjustable device carried by said loose gear, and a projection carried by and rotating with the gear shaft adapted to strike said adjustable device to drive said gear.

7 In an apparatus for graining explosive powder, in combination, a pair of graining rolls, a shaft for each roll, a gear upon each shaft, said gears intermeshing, one of said gears being fixed on its shaft, and the other gear loose on its shaft, a shaft driving member carried by and rotating with said shaft and adjustable connection between said loose gear and the said shaft driving member whereby said loose gear is adapted to have a limited rotary movement upon its shaft.

8. In an apparatus for graining explosive powder, in combination, a pair of graining rolls, a shaft for each roll, a gear upon'each gear loose on its shaft, and a stop on said In testimony of which invention, I have gear making driving connection with the hereunto set my hand, at Wilmington, De1., shaft at the limits of the independent rotary on this tenth day of F ebruar 1909.

movement of the loose gear on its shaft, FRANCIS DU PONT. 5 said stop being adjustable for regulating Witnesses:

the extent of said rotary movement of the WM. S. LAMAR,

loose gear upon its shaft. J. ED. WILSON. 

